2001800028 has 12 divisors (see below), whose sum is σ = 4670866760. Its totient is φ = 667266672.

The previous prime is 2001799993. The next prime is 2001800029. The reversal of 2001800028 is 8200081002.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 2001799977 and 2001800013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001800029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83408323 + ... + 83408346.

Almost surely, 2^2001800028 is an apocalyptic number.

It is an amenable number.

2001800028 is an abundant number, since it is smaller than the sum of its proper divisors (2669066732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2001800028 is a wasteful number, since it uses less digits than its factorization.

2001800028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166816676 (or 166816674 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 2001800028 is about 44741.4799487008. The cubic root of 2001800028 is about 1260.2989187497.

The spelling of 2001800028 in words is "two billion, one million, eight hundred thousand, twenty-eight".